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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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Video: Cardiac Cycle (Part 3 of 4)

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